Petroleum and Natural Gas Fields in Wyoming Page: 169

                                
REVIEW OF OIL AND GAS FIELDS

at 2,126 to 2,156 feet, with an initial daily
open-flow volume of 37 million cubic feet of
gas and a shut-in wellhead pressure of 650
p.s.i. About eight wells were completed in the
Dakota sand (25 to 65 feet thick) at 2,085 to
2,660 feet; the initial daily open-flow volumes
ranged from 7 to 37 million cubic feet of gas.
After gas was discovered in the Sundance
formation on Mahoney Dome in 1925, a num-
ber of wells were drilled to the Sundance for-
mation in West Ferris; some of the wells in
the Dakota sand, which up to that time had
been drawn upon heavily, were deepened to
the Sundance. Late in 1925 the first well in
the Sundance formation, in the SW1/4SW1/
sec. 29, produced gas at a rate of 9 million
cubic feet a day on an open-flow test. Eight
more wells were completed in the Sundance at
2,570 to 3,164 feet, with initial open-flow vol-
umes ranging from 2 to 58 million cubic feet
of gas daily; the initial shut-in wellhead
pressure was 1,140 p.s.i.
Oil was discovered at West Ferris in 1940,
when a well in the C SE1/4SW1/4 sec. 29 was
completed for an initial daily production of
50 barrels of 42 API gravity oil from the
Tensleep sand at 4,274 to 4,293 feet. In 1941
a well in the S1/2YSW1/4 sec. 29 was drilled as
a deep test into the Madison lime to a total
depth of 5,344 feet. The well was plugged
back to the Tensleep at 4,302 to 4,387 feet and
produced 135 barrels of oil a day by pumping.
After producing oil for a short time, both
wells were plugged back and recompleted as
gas wells.
In January 1957 there was one shut-in gas
well in the field. West Ferris produced 23.9
million cubic feet of gas and no oil during
1954.  Cumulative production through 1954
amounted to .31,901 million cubic feet of gas
and 103,568 barrels of oil. Before the fall of
1937 most of the produced gas was delivered
into the Wertz-Mahoney-Casper pipeline sys-
tem, but since that time the gas has been trans-
ported through pipelines to Sinclair and Raw-
lins, Wyo. The crude oil was delivered into
the Mahoney I)ome-Sinclair pipeline system.
MANDERSON
The Manderson oilfield (fig. 107) is in Tps.
49 and 50 N., Rs. 92 and 93 W., Big Horn
County. The structure is an anticlinal plung-
ing nose, but the oil and gas accumulation is
probably due to stratigraphic trapping. Up-
dip facies changes from porous dolomite to red
shale are observed in the Phosphoria formna-
tion. The Cody shale is exposed over most of
the field, and some Mesaverde sandstone forms
bluffs in the north and south ends of the field.

The elevation of the field ranges from 3,650
to 4,250 feet.
The discovery well was drilled in 1950 in
the C SEl/4NW1/4 sec. 20, T. 50 N., R. 92 W.,
and abandoned at a total depth of 5,741 feet in
the Morrison formation with no shows of oil
or gas reported. In May 1951 operations were
resumed by a new operator, and the well was
completed July 24, 1951, for an initial daily
flowing production of 1,032 barrels of 36.9
API gravity oil and 2,683,000 cubic feet of
sour gas (23.2 percent hydrogen sulfide) a day
from the Phosphoria lime at 7,258 to 7,303 (?)
feet. The log of this well shows the depth, in
feet, to the top of formations as follows:
Lower Mesaverde, 1,205; Cody shale, 1,286;
Frontier, 4,242; Second Frontier, 4,363; Third
Frontier, 4,631; Mowry, 4,788; Muddy, 5,287;
Cloverly, 5,503; Morrison, 5,623; Sundance,
5,965; Gypsum   Spring, 6,285; Chugwater,
6,465; Dinwoody, 7,165; Phosphoria, 7,220;
Phosphoria saturation, 7,258; Tensleep, 7,475;
Amsden 7,630; and Madison, 7,855.
Oil was discovered in the Tensleep forma-
tion at the No. 2 Wycol-Gov't. well, in the C
SW1/4NW1/4 sec. 1, T. 49 N., R. 92 W., Febru-
ary 18, 1954. Initial production by pumping
was 97 barrels of 35.3 API gravity oil a day
at 5,895 to 5,970 feet.
Oil was discovered in the Muddy sand at the
No. 5 Wycol-Gov't well, in the C SE1/4NE/4
sec. 12, T. 49 N., R. 92 W., April 30, 1955. The
initial daily flowing production was 1,760 bar-
rels of 60.2 API gravity oil and an estimated
12 million cubic feet of gas at 3,370 to 3,410
feet. The Muddy-sand thickness in the Man-
derson area averages 22 to 35 feet. It is uni-
formly developed in the area and is very sus-
ceptible to artificial fracturing.
Oil was discovered in the Octh Louie sand-
stone of the Mowry formation in December
1955. The first well in lot 37, sec. 2, T. 49 N.,
R. 92 W., had an initial daily production of 7
barrels of oil. The producing interval was
3,512 to 3,537 feet. Later, two other wells
were completed in this sand, with an initial
daily production of about 6 barrels per well.
Analyses of oil from the Mowry, Muddy,
and Phosphoria are given on pages 429 and
430. Analyses of gas from the Muddy and
Phosphoria are included in table 8 (p. 289).
About 30 wells have been drilled in the Man-
derson field. Of these, 6 produce oil and sweet
gas from the Muddy sand, 3 produce oil from
the Mowry formation, 13 produce oil and sour
gas from the Phosphoria lime, 1 produced
some oil from the Tensleep sand, 1 was tem-
porarily abandoned after it had produced some
oil from the Phosphoria lime, and the others
were abandoned as failures.

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